package cn.tedu._03vehicle.base.filters;

import cn.tedu._03vehicle.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = {"/v1/vehicle/*"})
public class LoginCheckFilter implements Filter {
    /**
     * 过滤器初始化方法，在服务器启动时调用一次
     * @param filterConfig
     * @throws ServletException
     */
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.debug("过滤器初始化方法...");
    }

    /**
     * 核心的过滤方法，每次请求时都会调用此方法
     * @param servletRequest
     * @param servletResponse
     * @param filterChain
     * @throws IOException
     * @throws ServletException
     */
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.debug("进入登录状态校验的过滤器...");
        //HttpServletRequest是ServletRequest的子接口，所以可以强转为HttpServletRequest
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取session会话对象
        HttpSession session = request.getSession();
        //获取会话标识
        UserVO userVO = (UserVO) session.getAttribute("user777888XXX");
        //判断
        if (userVO != null){
            //有此行代码,代表放行;
            //无此行代码,代表拦截;
            filterChain.doFilter(request,response);
        }else {
            response.sendRedirect("/login.html");
            //因为无filterChain.doFilter(request,response),代表拦截;
        }
    }

    /**
     * 过滤器销毁方法，在服务器关闭时调用一次
     */
    @Override
    public void destroy() {
        log.debug("过滤器销毁方法...");
    }
}














